I believe IMRA, which has evolved into a D2 association, began life as a mixture of TQ's and Mini Sprints, adding the stock automotive powerplants later and phasing out the TQ's. I see no reason why a TQ (especially unbound by rules) couldn't be competitive given the right set of circumstances, much the way a Mini Sprint ended up 3rd in points at Montpelier last year.
But, who in their right mind would put a 'busa in a Mini Sprint?
Stay tuned...